Drafting tool



i bers can be omitted, the pivoting element 4: a t ght n d f z's idpartsiinan es' 1";

Patented Sept; 13,1932 v nnIc awomnmyjo nocx ISLAN ILLI vors. i

4 fDRAErINq roonflf I t Application filed January'w, 1931. Serial No.'509,845 I I wfl V My invention has reference to. a drafting 21 maybeclampedtog'ether for unitary actool, and more-specially'toa radial rule,emtion., '1' i a. t

bracing a rule or straight-edge, andsupport- The other end of the arm 2is pivotally coning arms therefor capable of a compound nected with. ashorte'rarm ,5, byameanssof a 3:

5 movement, making it possible to effect endbdltfifiprovidedwith a.thumb-turn Z by 55 less variations in the position of the rule, fortighteningjwhich the arms 2 and, 5 may i be making lay-outs ofgear-teeth, ratchetheld from-movement-independently of: each wheels,generators, rotary cutters, and other other; If desired, washersmayrbe'usedvbefigures involving a repeated drawing of tantween the arms2 and 5, and between theother 1 gent 1ines,.radial lines, and linestaking oflt' end of-the 'arm 2 and adjacent parts, as'shown so fromradial lines. a vatj9 and-10; Thearm 5, has-an "upwardly The inventionis designed for operation on bent extension 11', in whichis held aneyebolt I a drawing board or other plane surface, 12,.pr0vided onits-threaded end'fwith a V and the support for the rule consists of athumb-nut 13.1 Slidable in h y Ofthebolt compound arm one end of whichis fitted with 1-2 is a needle-pin 14;, which can be held from a; l

' a needle-point for insertion in the drawing movement by tighteningthez nut 13. The board, and the other end of which has a pivrelativelengths of the arms 2 and 5 may be otal connection with the rule. Theneedle varied in any desired manner. i point forms a pivot about whichthe instru- When in use the rule 1 is laid upon the ment may be turnedfor a complete revolupaper 'ona' drawing board, and aiconnection 76.

tion. Clamping devices are also provided madebetween thetool andboardbymean'slof V V for holding the rule or supporting arms in thep nll;[Onejend of-the'ruleisthenposi: adjusted positions. Adaptations. arealso tionedto conform to the; radialplineorother" possible wherein oneor both of the arm memline WlllCh is to be reproduced, and the nutsbeing connected directly with the remaining tablishedy 'osition; One orother of" the arm or with the rule itself .straightre gefs of'the rulecan then be used as v The construction, arrangement, and manguideiforthe pencilin forming the desired ner of using the invention will be morefully lines-After one l ne has been producedby 21.

understood from the following specification, h t l of the'rlile anydesirednumher'of 6" reference being had to the accompanyingmovementsthereof can bemadeaboutthe pin 1 drawing, in which p a i i 1 4:as a centertoeffect a repetitionof, said" Fig. 1 is a plan view'oftheinvention. lines. The pointat which said pm is set is. Fig. 2 is an edgeview thereof; hecenter of the c rcumferenceoftheobpctgi I I Fig. 3 is across-section on the broken line iw h be ng "181d O t, and by m me t of3 3 f Fi 1, the rule one side of a gear tooth, or ratchet Fig. 4 is afragmentary detail showing a F r P- h eli esi e at ny difierentarrangement of the tool, as applied deslrred number of tunesto the arm2.

Fig. 5 is a similar showing of a varied ar- Hturnedffor operation oneither side of 'the 6 t th 1 1 arm 5, and either'edgeof the to oljcan beused rangemen or e m e informing the'lines; At A in Fig; 1 is indi- Thereference number 1 Ind-mates hnear i cated a fractional part of alay-out ofratch'et rule Pref-stably fi m of h of sheet teethQtherulebeing-inposition for forming .1 metal, the sldes of Whlch e Parallelgh the-radial edges of the teeth,fand by rearing it;

edg All m 2 t a plvotal Pomlectlon. said ruleforpredeterminedintervalsabout r V with the rule, at a point between itsends, by th 1 1 .14, ll fh dja1 d s b 11th means of a bol 3, p ing h gid pa linedfif Bypositionin'g the tool: as shownfinf and threaded at itsend. to receive a thumb- :brokenlines the slopingedge'sof the teeth can-M a i turn 4, by means of which the rule and arm .be indi'cated on thedrawing; In this'work "1k It will beobvious that the armQTCaIi 'be a 1'2'. A draftingtool, comprlsing'a primary the tool can be guided by onehand and the 'be integrally formed, where the adjustment of the rule 1alone is required. When the arms are pivotally connected an adjustmentthereof maybemade to space the pivot point of the'rule-a greater or lessdistance from the 7 work. I

center-point, to accommodate such rule tothe- For some kinds of work thearms canbe dispensed with, and one end of the arm- 2 pr0.-.,

vided with an upward extension 16, (Fig. 4 I

held a needle-pin 18, the bolt being fitted with a thumb-turn '19. -Therule is pivoted to the other end of the arm 2 as in the former'showingythe pivotal point .being rotatable j about the pin 18, and therule pivot'ally adjustabl'e as before. In Fig. 5 is indicated a formwherein both of the supporting arms are omitted,- one end of the rule 1being turned upwardly at 20, for the support of an eyeb.olt21,finwhich-is held a pin 22, bymeans of a thumb-nut 23. In thisform the rule can 'be rotated about the pin 22, in the formation of somesimple figures. In all of the forms shown. the needle-pin can beadjusted verti- .cally. by loosening-the nut on the eye-bolt.

with said primary arm, and a linear-rule having a pivotal connectionwith said secondary arm, also arranged for a slidable contact with saidplane surface.

. 5. In a drafting tool, I a primary arm adapted for a slidableengagement with a plane surface, and provided at one of its ends withaneedle-point support,- a needle point' held in saidsu-pportverticallyto the plane of 'said arm, and capable of adjustment verti-" cally,,asecandary'arm pivoted to the other end of'said primary arm, a linearrule having pivotal connection with said secondary arm, and adapted fora slidable contact with said in which is held an eye-bolt. 17,-LILWhlClIjS 1%.

3 In testimony whereof I afiiX my signature; I

. WhatI claim, and desire to secure by Let- 1 I ters Patent, is s V I 1;A draftingtool, comprising ali-near rule,-

' a compound arm sup-port therefor provided y. at one endwith aneedle-point for insert-able engagement with a drawing-board, and aboutwhich. said arm may rotate freely and pivotally connectedwith the ruleat the other end,

.and means forholding said rule immovable with relation tosa'id'support.

providedaton'eof its'ends with a'needle 'point for pivotal attachment toa plane sur face,'a secondary arm pivoted to-said primary formed ofangularlydisposed arms, a needle point connection atone ofthe'endsof'said v 7 support, and a linear-rule havinga "pivotal r r.

connection with the other end thereof,f'at a point intermediate the endsof said rule and I I 7 adapted for a slidable movement on the face of adrawing board.

4.1m a. drafting tool, aprimary arm: bent upwardly at one endto form avertical support for aneedle-point, a needle-point connected with saidsupport and. adapted-for. a

penetrable attachment to a plane surface, with 3. A drafting tool,comprising a support y I ERIGFA- WQLFRAM;

ia m ins d are a ion with saidplane surfacga secondaryarm-pivotally'connected a 7 '7

